Malicious PDF — malware analysis report

Static analysis result for SHA-256 f076804bb5cb1c13…

MALICIOUS

PDF

90.8 KB Created: 2021-04-04 16:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e8e102b7531343120b35d9463068bea SHA-1: 9f8c3b308ef7d3d5246ab86be805c39515a996f7 SHA-256: f076804bb5cb1c13c6d98b7ead1269fb33802129280a6414d5a5e0ef285a9166
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One of the primary links, 'https://crophysi.ru/award?keyword=pares+emocionales+biomagnetismo+pdf', is identified as pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings strongly indicate a malicious intent related to link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/award?keyword=pares+emocionales+biomagnetismo+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fc7a2d82b805.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5feb19f060b40.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/59265862425.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/clasificacion_de_las_cuentas_capital.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601ae9b8c053a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_604b9ab929440.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/mejaguf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b25bf8-941d-4b51-8eda-be6daa304603/powerpoint_presentation_on_rational_numbers_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa78118-203b-4e4f-948f-d9d76282c050/lexumoxinewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a4a393-36a6-4a9e-b770-e1f8c91fdacc/instrument_used_to_measure_weight.pdfIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_d6c6bd6d1cf44759a0e526f2673861b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba88d688-5da0-4853-b3ab-ef21c83bbf5c/80449886880.pdfIn PDF document text
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_763a4cfd7e5f4f098ef347819c52c917.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_1fd01ebecd874c54ac177e7545aeb82d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/230a10d6-f518-44b2-b387-5694af48bce1/45294831031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bd549c-9138-4a45-bba9-2dd06d850368/basic_english_module_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d142b3d7-b0d6-474f-9df1-8503f84419c4/how_to_apply_lubricant_to_elliptical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fb0d31-50b2-44af-8ca8-d5d254178f6f/wheeler_remington_700_action_wrench.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd63de8-17e6-4829-b4c9-dcb90e4e9ca7/refutoxiwojum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf9d615-61b1-4c50-83de-a00e8db58678/52180922713.pdfIn PDF document text
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_48397a17159c4f0e838ae05de3a4c677.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_f9e40fb12f3640bcacf0a6f5893140b6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 5616 bytes
SHA-256: 895e0b40bc36aff73702def2408c524226ff46d5d281630b19b22b68320c47ca
font_01_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 12480 bytes
SHA-256: 140fe4a871c73ff7a97ce617ba9dc7df87b2f10514db138d9437c2bd6557769c
font_02_sfnt_off00014628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14628 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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